How to characterize a PLL ?

[vbhupendra]

pll characterization

How to characterize a PLL ? what is the simulation setup for it ?

 

[Miguel Gaspar]

pll full characterization

You can consult the book
PLL of the PhD ROland E. Best
in that book one of the latest chapters respond your questions

 

[yaxazaa]

Re: PLL Characterization

PLL is ocmposed of PFD, CP, VCO, and divider.

1. You need to do loop dynamic design to make sure the loop is stable and meet you settling requirements, in the meantime, extract the indivual block design parameters.

2. Design individual block according to the loop requirements
3. Loop simulation includes
a. basic lock in time
b. reference step
c. pwr noise inject
d. referenec jitter
f. phase step

 

[icx]

Re: PLL Characterization

what's the “reference step”？
what's the “phase step”?

 

[Miguel Gaspar]

PLL Characterization

reference signal is the input signal of the PLL.
The Phase detector must detect the phase difference betwen the reference signal and the feedback signal (VCO output).
The reference step is a step in frequency of the reference signal. If the step puts the frecuency in the lock range the PLL must acquire the lock un at most 1 beat of the natural frequency. if the Pll adquire the lock in more than a one natural frequency beat the reference signal is in the pull-in range.